Home Auto Repair 2004 Ford Mustang Engine – Spark Knock on Light Load/Acceleration

2004 Ford Mustang Engine – Spark Knock on Light Load/Acceleration

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Download ISSUE Various vehicles equipped with a 3.8L, 3.9L or 4.2L engine and Split Port IMRC may exhibit spark knock under light load and acceleration. ACTION Follow the Service Procedure steps to correct the condition. SERVICE PROCEDURE Inspect for disconnected IMRC actuator rods. 1. Check both right hand and left hand side IMRC rods are properly attached to the actuator motor and intake manifold runner. 2. If the IMRC actuator rods are found to be connected properly, do not continue with this TSB. Refer to Powertrain Control/Emission Diagnosis Manual. 3. If any IMRC actuator rods are disconnected, refer to Workshop Manual (WSM), Section 303-14 for IMRC service. 4. If any IMRC actuator rod linkages are found disconnected, replace all four (4) linkage rod retainers. (Figure 1